You can use this Modern Custom 404 Error Page pack for any type of errors on your site.
It is designed with usability in mind – to help the user get what he wants . It also has an area in footer for navigation, so user can decide where he wants to continue his browsing.
Also, user can report the problem to you by clicking the “Contact Us” button.
It’s fully customizable and browser compatible ( Chrome,Firefox, Opera,Safari, IE8, IE9) you can choose between 16 color schemes.